Evaluate 3(10x − y) − 9(x + y2) for x = 2 and y = −5.
Substitute the given values for x and y into the expression.
3(10*2 - (-5)) - 9(2 + (-5)^2))
Work out the contents of the bracketed terms.
3(20 + 5) - 9(2 + 25)
3*25 - 9*27
75 - 243
-168
Answer: The expression evaluates to: -168